/usr/lib/x86_64-linux-gnu/pkgconfig/libgnomeui-2.0.pc is in libgnomeui-dev 2.24.5-3.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
libgnomeui_serverdir=${libdir}/libgnomeui-0
Name: libgnomeui
Description: libgnomeui
Requires: libgnome-2.0 libbonoboui-2.0 libgnomecanvas-2.0 gtk+-2.0 gdk-pixbuf-2.0 gnome-vfs-2.0
Requires.private: libart-2.0 gconf-2.0 gnome-keyring-1
Version: 2.24.5
Libs: -L${libdir} -lgnomeui-2 -lSM -lICE
Cflags: -I${includedir}/libgnomeui-2.0
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